19.25: Well that's it from me folks - thanks for following this afternoon but join me tomorrow as it's women's semi-final day at SW19. Cheerio.

19.23: From Sportsmail's Charlie Sale:

'Really stupid question to Andy Murray by BBC TV interviewer Garry Richardson trying to get an Alex Ferguson line straight after his five set victory. Would Murray's coach Ivan Lendl be giving him the hairdryer treatment? Understandably after such a hard-fought win, Murray showed his obvious annoyance.'

19.20: Andy Murray spoke to the BBC after the match:

'He served unbelievably well even when he was behind, he kept going for it. Second set my level dropped as I rushed things but I managed to turn it round.

'It was a combination of things, he played very well but in the second set I made mistakes. He is a very good player and he is now playing like he was a few years ago.

'At the end of the match I took my time and it made the difference as I was making the correct choices.'

19.17: There is really a great crowd on Centre Court, they cheer Murray's win with almighty gusto and even offer a round of applause for Verdasco as the Spaniard waves before departing centre Court.

Murray with a fist pump will stop to sign a few autographs and he will now face the Pole Jerzy Janowicz on Friday in the semi-finals.

Comeback complete: Andy Murray celebrates coming back from two sets down to beat Fernando Verdasco

19.14: Given the pressure - Murray makes this look ridiculously easy. He serves an ace down the T to bring up three match points, and he only needs one as Verdasco fires over the baseline to hand Andy Murray game, set and match.Verdasco 5-7 Murray 6-4, 6-3, 1-6, 4-6

19.11: Murray is now serving for a place in the semi-final then and the fans are really roaring their man on now.

19.08: An opportunity for Murray as Verdasco double faults then loses the next point to hand the Brit a 15-30 lead. The Spaniard volleys at the net to level up, before a lengthy rally that Murray does very well to wrestle control of ends with Verdasco finding the net. A critical break point coming up for Murray which he gets as Verdasco loops a forehand over the baseline. He will now serve for the match - it's the first time he has been in front too.Verdasco 5-6 Murray 6-4, 6-3, 1-6, 4-6

19.05: Verdasco attacks the second Murray serve but he is too keen this time as he fires over the baseline not once but twice to give Murray breathing space on serve. An unreachable serve out wide gives the Brit three game points and he only needs one as he controls a rally perfectly to force Verdasco to fire low into the net.Verdasco 5-5 Murray 6-4, 6-3, 1-6, 4-6

19.02: I sometimes wonder how Murray keeps some of these rallies going. The Brit comes back time and again to put pressure on Verdasco, but the Spaniard to his credit keeps his powerful serve up to hold to 15 - great stuff from both players there but Murray is now serving to stay in Wimbledon.Verdasco 5-4 Murray 6-4, 6-3, 1-6, 4-6

18.59: Very nervous moments for Murray as he falls 0-30 behind on serve, but he takes the next three points to gain back the advantage before a weak Verdasco return sees the Brit serve out the game. From both players' perspective there is no room for error now.Verdasco 4-4 Murray 6-4, 6-3, 1-6, 4-6

18.56: These two have only gone to five sets before - Verdasco taking it (his only win over Murray) back in the 2009 Australian Open.

Covering ground: Andy Murray was often left tracking the court to contend every point

18.53: Incredible guts from Verdasco who rifles an ace down the T on his second serve at 15-30 behind. The Spaniard takes the next point too before firing another ace down the T. That was a very impressive given the circumstances during the game.Verdasco 4-3 Murray 6-4, 6-3, 1-6, 4-6

From Sportsmail's Mike Dickson:

'There won't be any fitness issues in this match even though we are over the three hour mark. Verdasco a very hard worker like Murray.'

18.50: Anything Verdasco can do, Andy can do better as Murray holds to love. A very even fifth set so far - who has the legs and the belief to see this through? Murray looks favourite.Verdasco 3-3 Murray 6-4, 6-3, 1-6, 4-6

18.47: We are stuck into the fifth set and still we see some fantastic rallies. Verdasco fires a great forehand winner in the latest to help him into a 40-0 lead, before another cross court forehand winner sees him hold to love.Verdasco 3-2 Murray 6-4, 6-3, 1-6, 4-6

18.44: Nervy start to the Murray serve as he falls 0-15 behind but successive points soon see him take advantage again. Verdasco finds the net to give Murray two game points and the Spaniard fires wide to give the Brit an otherwise easy hold.Verdasco 2-2 Murray 6-4, 6-3, 1-6, 4-6

18.41: Easy hold to 15 for Verdasco. For the first time in a long while, Murray never got close to the Spaniard on that service game.Verdasco 2-1 Murray 6-4, 6-3, 1-6, 4-6

From Sportsmail's Mike Dickson:

To use the most common phrase of the week, important not to get ahead of ourselves. Fifth sets in tennis are a whole new dynamic when it’s gone from 0-2 to 2-2 as we saw in US Open final and confident start to the decider from Verdasco.

Powering through: Andy Murray returns a shot to Fernando Verdasco

18.38: From Sportsmail's Alex Kay:

'So, a one-set shootout for a place in the Wimbledon semi-finals. Murray needs to keep his first serve percentage up near the 80 per cent mark, as it was in the last set.'

18.35: Murray is literally diving his way round the court now to win points and it's paying off as he holds to 15.Verdasco 1-1 Murray 6-4, 6-3, 1-6, 4-6

18.32: Into a decider we go then and Verdasco looks on course for an easy hold until he fires a senseless volley wide at 40-15. The Spaniard recovers though and serves out to move ahead.Verdasco 1-0 Murray 6-4, 6-3, 1-6, 4-6

18.29: More from Sportsmail's Alex Kay on the all-Polish quarterfinal:

'Janowicz beats Kubot, they hug for AGES and then swap shirts football style. Janowicz is 6ft 8in though so Kubot's shirt is a tad small on him.'

Back in it: Murray came from two sets down to level the match

18.26: And the match is all square as Murray blasts Verdasco apart on serve to hold to love and make it all square at 2-2.Even the sun is out now and it looks here to stay.Verdasco 4-6 Murray 6-4, 6-3, 1-6

18.23: A case in point. Left with a simple volley to move 40-0 ahead on serve, Verdasco can only fire a tired looking shot into the net. Murray finds the net on his next shot, but a long Verdasco forehand keeps the game tense before Murray fires wide. The Scot will now focus on serving out the set.Verdasco 4-5 Murray 6-4, 6-3, 1-6

18.20: Verdasco looks like a little bit of a mess now. Murray with a roaring crowd fully behind him serves to love and the Spaniard is showing huge mental fragility. This match is only going one way folks, and that's Andy's.Verdasco 3-5 Murray 6-4, 6-3, 1-6

18.17: Another dicing rally sees Murray volley ahead at the net to earn break point, and he manages to break Verdasco with the next point after the Spaniard fires over the baseline.Verdasco 3-4 Murray 6-4, 6-3, 1-6

About to bite the dust? Fernando Verdasco reacts after losing a point to Andy Murray

18.14: Momentum looks to be with Murray as he moves 0-30 ahead on the Verdasco serve, but the Spaniard wins the next three points before firing wide to take the game to deuce.

18.11: Another break point earned by Verdasco, this time due to a superb backhand winner, but Murray responds with a timely ace.

Verdasco then finds the net reaching out with a back hand from the baseline before Murray serves out with a huge hold - at least from a psychological perspective.Verdasco 3-3 Murray 6-4, 6-3 1-6

18.08: Nervy times for Murray as two unforced errors see him fall 0-30 on serve. A rifling ace down the T eases the pressure slightly, as does a long Verdasco back hand to level the scores.

But Murray fires over the baseline again to concede a break point to the Spaniard, only for Verdasco to follow suit and bring this game to deuce.

18.05: Verdasco double faults give Murray a 15-30 lead, but the Spaniard sticks with Plan A and it comes up trumps as he wins the next three points to hold.Verdasco 3-2 Murray 6-4, 6-3, 1-6

18.02: And an even easier hold for Murray, who unlike his first service game in the fourth set comes through totally unscathed this time.Verdasco 2-2 Murray 6-4, 6-3, 1-6

17.59: And while Verdasco serves out with ease, Jerzy Janowicz has triumphed to defeat Lukasz Kubot 7-5, 6-4, 6-4. He will face the winner of Murray and Verdasco in the semi-final.Verdasco 2-1 Murray 6-4, 6-3, 1-6

17.56: What a crucial break for Janowicz. A Kubot lob bounces wide and it gives the former the chance to serve for a straight sets victory.

17.53: What an eventful deuce that was! Murray saves another break point, but both players dance up and down the court which results in a Verdasco dive, just failing to return over the net. Murray holds and a Centre Court crowd is relieved.Verdasco 1-1 Murray 6-4, 6-3, 1-6

From Sportsmail's Mike Dickson:

'Both players take a loo break. It’s Murray’s most important loo break since the US Open final at two sets all. He’ll be wondering how he got to this place while Verdasco will tell himself to keep the aggression up in the fourth set, because it will be harder to play with such unbridled and freeflowing aggression if it gets to a tense fifth.'

17.50: Brilliant tennis from both players but a net cord hit from both players in a long rally results in Murray chipping into the net to leave Verdasco with a break point- one that Murray saves to bring up deuce.

All eyes on Murray: Fans gather on Henman Hill to watch the Centre Court action

17.47: So can Murray keep this surge of momentum up? Verdasco loses the opening point on serve but aces out wide before Murray returns over the baseline twice for 40-15. The Spaniard then holds as Murray fires a forehand into the net.Verdasco 1-0 Murray 6-4, 6-3, 1-6

17.44: Even Murray has gone for a break now, so our attention quickly switches to Court 1 where Janowicz and Kubot are level at 3-3 in the third set, with the former 2-0 up in sets.

17.41: And there it is. Almost as soon as Murray holds to 15 with a deft volley at the net, the sun comes out and Verdasco goes off to sort his head out with a break. The momentum is fully with the Brit despite being 2-1 down.Verdasco 1-6 Murray 6-4, 6-3

17.38: A Murray resurgence or a Verdasco collapse? It has to be a bit of both. The Spaniard's serve is nowhere near as potent as it was earlier and Murray is attacking whenever he can now. It's another break for the Brit who will now serve for the set.Verdasco 1-5 Murray 6-4, 6-3

17.35: It's 2-2 in the third set on Court 1, but Kubot has blown a great chance to break Janowicz in deuce as the 24th seed goes on to hold.

17.32: This is much more like the Murray we have seen at Wimbledon this year as despite a slight wobble on serve, he serves out with an ace.Verdasco 1-4 Murray 6-4, 6-3

From InfostradaSports:

Murray is 2-sets down. He is 5-14 in Grand Slams when losing the 1st two sets and 1-3 at #Wimbledon. That only win was v Gasquet in R4 in 2008.

In control: Fernando Verdasco took a commanding 2-0 set lead over Andy Murray

17.29: A double fault gives Murray a break point, but Verdasco hits back to gain deuce again before serving out with a glorious cross-court backhand.Verdasco 1-3 Murray 6-4, 6-3

17.26: A penny for Verdasco's thoughts. He moves 4-0 up on serve but throws away his advantage to allow Murray to gain deuce. Is the Spaniard cracking under pressure? He certainly is making very bad errors now.

17.23: Over 90 minutes into this match and this looks like the start of the Murray comeback. The fans are onside, Verdasco is feeling the pressure and Murray serves out to 30 to move into a comforatble third set lead.Verdasco 0-3 Murray 6-4, 6-3

Encouragement: Fans inside Centre Court get behind Andy Murray

17.20: From Sportsmail's Mike Dickson:

Murray goes two sets down. 113 mph second serve at deuce from FV. "what the f+++ are you doing? " shouts Murray at the changeover.

Well Murray is back on form here, as he holds his nerve. While at the same time Verdasco has allowed errors to creep into his game as the Brit breaks at the start of the third set.Verdasco 0-2 Murray 6-4. 6-3

17.17: From little acorns do big oaks grow and although Murray is taken to deuce on serve, the Brit serves out to stop the rot at the start of the third set.Verdasco 0-1 Murray 6-4, 6-3

17.14: After losing the first two sets against Fernando Verdasco, Andy Murray’s odds to reach the semi final have considerably lengthened. Odds comparison site Oddschecker.com can reveal that Murray has gone from 1/19 to beat the Spaniard to a best priced 11/10. Verdasco, however has come in from 8/1 to a best priced 10/11 to beat the Scot.

17.11: Speaking of going two sets up, Jerzy Janowicz is also one set from victory in the all-Polish clash against Kubot on Court 1 after winning the second set 6-4:

From Sportsmail's Mike Dickson:

'At the moment I’m seeing worrying comparisons between this Murray match and the 2009 semi-final versus Andy Roddick. Dangerous cocktail of over cautious and tight Murray and inspired opponent. Verdasco serve a revelation so far.'

Frustration: Murray reacts after losing the second set to Verdasco

17.08: It really is a disaster for Murray now as Verdasco holds his composure in deuce to serve out and take the second set. If Murray is going to reach the last four - he is going to have to do it in five sets. Not impossible, folksbut a tall order given the Spaniard's performance.Verdasco 6-3 Murray 6-4

17.05: But now the pressure is on Verdasco. Murray pretty much covers every blade of grass on Centre Court in a 28-shot rally to move 0-30 ahead, and then gains three break points.

The first he fires low into the net, the second just bounces over the baseline - the third has Verdasco pulling Murray all over the court before finishing the Brit off with a deadly forehand. Into a crucial deuce we go.

17.02: Not even luck is on Murray's serve now. After falling 0-30 behind, Murray is soon facing break point and it's one he loses after Verdasco catches the net cord, leaving Murray with no chance to return and the Spaniard with a double break.Verdasco 5-3 Murray 6-4

16.59: This is quite inspired from Verdasco. The Spaniard's serve is as good as anyone I have seen at this tournament so far and he edges ahead. Murray appears to have little answer at this stage.Verdasco 4-3 Murray 6-4

Sitting out: Andy Murray takes a rest during the second set against Fernando Verdasco

16.56: Dear, oh dear. What's happened to Andy? Verdasco is back to his bouncy first set self and gains two break points on the Scot. the Spaniard only needs one as after doing well to return serve, Murray over hits the baseline.Verdasco 3-3 Murray 6-4

16.53: Some news to bring you on the order of play and tomorrow's women's semi-finals, as Marion Bartoli and Kirsten Flipkens will open up play, followed by Sabine Lisicki and Agnieszka Radwanska.

16.50: Murray by contrast is much more aggressive now, but despite another promising start to the Verdasco serve, the Spaniard serves out well with an ace.Verdasco 2-3 Murray 6-4

16.47: Verdasco is much more passive in this second set but then Murray has responded very well to that first set loss. 'Muzza' aces down the T to move 40-0 up but despite a failed forehand slice, holds with a volley at the net. On Court 1 it's 2-2 in the second set between the Poles.

Verdasco 1-3 Murray 6-4

Pole position: Jerzy Janowicz (top) took the first set against Lukasz Kubot

16.44: Big cries of 'Come on Andy' as he hits superb backhands to move 0-30 in front, but a cracking ace out wide and a failed Murray return see the Spaniard back in it. Verdasco though fires a forehand out wide to give Murray break point and another error from the left-hander gives Murray a break in the second set.Verdasco 1-2 Murray 6-4

16.41: Centre Court is full albeit the crowd are a bit nervous now, but Murray responds by racing 40-0 ahead on serve. A loose backhand wide sees Verdasco pull one point back but Murray goes on to easily hold.Verdasco 1-1 Murray 6-4

16.38: It's also first blood Janowicz on Court 1, who held serve to take the first set 7-5 against Kubot. Back on Centre and Murray's downfall continues as Verdasco holds to love as he starts to find his forehand and more importantly his confidence.Verdasco 1-0 Murray 6-4

16.35: Huge point from Verdasco who unleashes a forehand close to 100mph across court to gain an unlikely set point. Murray on the cusp of losing his first of the tournament double faults by first firing into the net, then too far over the baseline.Admittedly, the Spaniard's ultra-attacking stance has paid full dividend thereto take the first set.Verdasco 6-4 Murray

16.32: Meanwhile Janowicz has broken on Court 1 and is now serving for the first set against Kubot at 6-5 ahead.

Reaching out: Andy Murray returns a shot to Fernando Verdasco

16.30: Verdasco is in troubles of his own making on Centre. A double fault gives Murray break point, but he recovers to take the game to deuce before a long Murray return sees the Spaniard edge in front again.Verdasco 5-4 Murray

16.26: A mad few moments for Janowicz on Court 1. The Pole saves a set-point before gaining two break points on Kubot in the next game at 5-5. His compatriot though recovers to take the game to deuce.

16.23: ... And breathe. Two errors from Verdasco see Murray hold again as we approach a critical point in the first set.Verdasco 4-4 Murray

16.21: A few nervous groans in the crowd as Murray falls 0-30 behind. But despite winning the next three points in quick time, the scot fires into the net to bring up deuce.

Re-united: After going to watch Novak Djokovic, Nemanja Vidic returned to sit alongside former Manchester United boss Sir Alex Ferguson on Centre Court

16.18: Mind you, they are not doing too badly on Centre as Verdasco serves out with an ace despite a quite horrendous error with a volley earlier in the game.Verdasco 4-3 Murray

From Sportsmail's Mike Dickson:

'So far Verdasco's famed forehand has been sprayed all over but his serving has been very potent, hard to get any rhythm for Murray.'

16.15: They are racing through the action on Court 1 as Janowicz is now serving to stay in the set at 5-4 behind. The average game time there is just under two minutes.

16.12: The Verdasco forehand still looks wild but a little warning for Murray as the Spaniard makes a rare venture to the net to close to 40-30.

No worry for Murray though, who follows suit to hold serve with a volley at the net.Verdasco 3-3 Murray

From Sportsmai's Alex Kay:

'Just the one unforced error from Murray so far. Verdasco has hit 10. The Spaniard is really trying to attack.'

16.09: We are still on serve on Court 1 where Kubot leads Janowicz 4-3. Remember the winner plays either Murray or Verdasco in the semi-final.

16.06: Amazing tennis to open the Verdasco serve. Murray looks like he has stolen an astonishing point with a backhand to the back of the court, but a flick from Verdasco sees him return in style and leaves Murray with too much to do to return.

16.03: After blowing a fairly good chance to break, Murray takes his frustration out on serve. The Scot fires an ace, before Verdasco skews a forehand well wide across court to see the scores level.Verdasco 2-2 Murray

16.00: Some pressure on the Verdasco serve as he survives break point to go to deuce. The Spaniard is showing a few nerves at the start of this match with a few errors. Murray just looks like a cool customer right now.

However, Verdasco serves his way out of trouble as Murray fails to return serve.Verdasco 2-1 Murray

From Sportsmail's Laurie Whitwell:

'Novak Djokovic's girlfriend, the diminutive Jelena Ristic, just walked past me on the media balcony on her way to the players' lawn. She was wearing some snazzy silver pumps that looked made out of aluminium and couldn't resist taking a picture on her phone of a packed Henman Hill in the distance. Even for seasoned tennis travellers it seems the sight of the masses at Wimbledon gathering to watch Andy Murray in action is worth a souvenir shot.'

Expectation: Andy Murray (above) took on Fernando Verdasco for a place in the semi-final

15.57: From Sportsmail's Mike Dickson;

'I don’t tend to join in with the ‘why the empty seats’ outrage at the start of matches because people are entitled to stretch their legs or whatever after sitting for hours at a time. But it doesn’t help Murray or anyone to talk out to a half empty Centre Court. Longer break between matches needed?'

15.54: No such nerves from Murray though who holds to 15 by thundering his own ace down the T. Court 1 is very empty for a men's quarter-final, but for the lucky few in attendance they have just seen Jerzy Janowicz hit an incredible serve that clocked 140mph.Verdasco 1-1 Murray

15.51: A few nerves for Verdasco who opens up with a double fault. The left-hander comes back into the game though and holds with a fine ace down the T.Verdasco 1-0 Murray

Del Potro joins David Nalbandian (2002) as the only players from Argentina to reach Wimbledon men's semis (in Open era).

15.45: As the players on both courts warm-up, here is Sportsmail's Charlie Sale with another snippet on the action away from the courts:

'A posse of Spanish journalists followed Sir Alex Ferguson on his way to the Royal Box today wanting a word from him about their compatriot Fernando Verdasco's chances in his quarter-final against Fergie's fellow Scot Andy Murray. Ferguson's one-word answer on Verdasco's fate this afternoon: 'Adios"

Tennis folklore: The great Rod Laver was in attendance on Court 1

15.42: From Sportsmail's Laurie Whitwell:

'Amusing soundtrack in the press room to Juan Martin Del Potro's phenomenal tennis at the end of his win over David Ferrer.

'There is an Argentine journalist who insists on calling in his copy to
editors 11,000 miles away in booming Spanish. As his compatriot claimed
match point he picked up the phone to give running commentary.

'The LA Prensa scribe got increasingly excited as the climactic point
edged closer to culmination and sounded very happy at the winner. He's
still chatting away now.'

15.39: Well it's the big one now folks...yes, the all-Polish clash between Lukasz Kubot and Jerzy Janowicz.

As much as that match will prove an interesting battle on Court 1, our attention of course turns to Andy Murray on Centre Court as he arrives to take on Fernando Verdasco. Clouds still hang over but they don't look as threatening as earlier.

15.36: Spare a thought for David Ferrer, folks. Alex Kay has just spotted a great moment from the Spaniard:

'Good man, David Ferrer. Not many losing players sign autographs as they walk off the court. Ferrer just did.'

From Sportsmail's Ivan Speck:

'Martina Hingis won the Wimbledon Ladies’ Doubles title with Helena Sukova as a 15-year-old in 1996. They are currently on opposite sides of the net on Court 18 in the Ladies’ Invitational Doubles, Hingis with Lindsay Davenport, Sukova with Tracey Austin.'

'It was a strong start for me today and I had a few chances to break in the first set and the tie-break. There was one mistake he made in the forehand. It was a very close set - he could have won both the opening sets.'

15.30: Juan Martin del Potro spoke to the BBC after the game:

'I think it's going to be dangerous if I'm not careful in the next few days but I think I played my best tennis in this tournament. I was really close to pulling out the match. It's really painful and I twisted my knee once again.'

15.27: Juan Martin del Potro and Novak Djokovic are through to the Wimbledon semi-finals.

Both wins came seconds within each other, with Del Potro squeezing a winner down the line to steal the match with a tie-break at 6-2, 6-4, 7-6 (7-5). The Argentine collapses on the floor but it's not in pain this time (I think) but with joy.

Djokovic could easily have been 2-0 down after the opening couple of sets but instead prevails 7-6 (7-5), 6-4, 6-3 to defeat Tomas Berdych.

The two winners will face each other in the semi-finals.

15.24: Easy hold for Berdych but now Djokovic is serving for the match. It's 5-5 in the tie-break on Centre Court.

Murray mimics: Fans show their support for Andy Murray

15.21: Meanwhile, Djokovic continues to race along on Court 1 as he holds to love by arcing an ace down the centre to see out his serve. Berdych is now serving to stay in the match.

15.18: Del Potro as ever makes it look easy as he holds to love and force a third set tie-break. it's the pressure cooker in Centre Court now. Is Del Potro closing in on victory or can Ferrer pull himself back into the match?

15.15: The pressure is off Ferrer... for now. He's done his bit as he secures at least a tie-break, but can he break Del Potro to steal the third set and move 2-1 behind overall?

From Sportsmail's Ivan Speck:

'Spare seat in the Royal Box, anyone? Manchester United defender Nemanja Vidic decided to leave Centre Court in order to support his Serbian compatriot Novak Djokovic on No.1 Court. No doubt he’ll be back to join his former manager Sir Alex Ferguson for the Murray match later.'

15.12: But while Del Potro steals the game to move the set to 5-5, Djokovic breaks to move 3-1 ahead in the third and possibly final set.

Rare sight: The sun made fleeting appearances during the day at SW19

15.09: Big moment on Court 1 as Berdych throws away two game points on serve to allow Djokovic to force the game to deuce.

Del Potro likewise is at the same stage against Ferrer, serving at 5-4 behind in the third set.

15.06: For perhaps the first time in this match, Del Potro is under pressure as Ferrer holds again at 5-4 up. The Argentine is now serving to stay in the set but to be fair it's not an area of his game which has caused much concern so far today.

On Court 1, Djokovic leads 2-1 in the third set which is on serve.

15.03: From Sportsmail's Alex Kay who has gone for a wander on the outside courts:

'I've been out watching US teenager Taylor Townsend, who had been asked not to enter last year's US Open because of her weight. She entered anyway and reached the last eight. And she was moving fine in my eyes, getting round the court with no problem and striking a very fierce ball.'

Famous faces: Garce Jones and Michael McIntyre arrive at Wimbledon to watch the day's play

15.00: He's a cool customer this David Ferrer chap. For much of the afternoon he has been under pressure, but not once has he shown an ounce of frustration and is becoming more competitive as this match progresses - despite being 2-0 down in sets. He leads 4-3 on serve against Del Potro in the third.

14.57: A perfect case study of how to throw away a set - foreword by Tomas Berdych. The Czech puts himself in trouble to hand Djokovic two break points, and although he aces out the first one, the seventh seed volleys an easy return straight into the net with the second. Djokovic somehow leads 2-0 in setshaving trailed with a double break at 3-0 down tin the second.

14.54: The pressure is soon back on Berdych though, as Djokovic holds. The Czech is now serving to stay in the set at 5-4 behind. It's with serve on Centre Court as Ferrer leads 3-2.

14.51: Berdych stops the rot with a hold to 15 but perhaps just as importantly looked in control doing so. The Czech had this set as good as wrapped up at 3-0 so has responded well to level the scores after going 4-3 behind.

Fightback: Novak Djokovic fought from a double break down to put the second set back on serve

14.48: That's four games won in a row now for Djokovic as Berdych just over hits in a baseline rally to hand the Serb a 4-3 lead. On Centre Court it's 2-2 in the third as Ferrer prepares to serve.

14.45: Absolutely brilliant from Djokovic. From 3-0 and a double break down, the Serb has now broken Berdych twice to level up the set. A dramatic swing in momentum now on Court 1 in the 2011 champion's favour.

14.42: Djokovic holds with much more confidence now as he attempts to fight back from that double break at 3-2 down. Don't be fooled by the sun beaming down on the courts, there are some very dark clouds hanging around Wimbledon.

14.39: From Sportsmail's Mike Dickson:

'Ninety minutes can be a long time in tennis as well as football. That’s how long it has taken for Juan Martin Del Potro to go from looking like he would invalided out of the tournament to two sets up versus David Ferrer.'

In control: Del Potro broke Ferrer at the end of the second set before holding to move 2-0 up

14.36: Game and set to Del Potro as the Argentine holds to take the second set 6-4. The eighth seed now lead 2-0 overall and is just one set away from giving those injured legs a much needed rest.

On Court 1 there is a twist as Djokovic breaks straight back to trail 3-1 - he now has a lifeline in this set.

14.33: From Sportsmail's Jon McEvoy:

'Berdych is making a match of this just when you feared his losing the first set might be the beginning of the end.'

14.30: Meanwhile, Del Potro has broken Ferrer at the perfect time to lead 5-4 and is now serving for the second set.

14.27: Earth to Djokovic - the second set has started, you not be aware. Berdych performs a double break to move 3-0 ahead and right now the Serb is looking no where near his best from the first set.very strange as dark clouds loom again.

14.24: And no messing from Berdych on serve either who holds to 15 - the Czech has now won seven of the last eight points.

On Centre Court, Del Potro is starting to move more freely as he levels at 4-4.

Short lived: Novak Djokovic won the first set but was broken at the start of the second by Tomas Berdych

14.21: Wow, where has this come from? With a first set in his pocket, Djokovic should be firing on all cylinders, instead he hands three break points to Berdych.

The 2011 champion then faults before his second serve is returned by the Czech and it leads to Novak miscuing badly to lose his serve to love.

14.18: As one set ends, the business end approaches on another. It's 4-3 to Ferrer on centre but it remains on serve.

14.06: What's that yellow thing in the sky? No worries, my colleagues inform me it's something called the sun and it baths down on SW19 as Del Potro holds serve to level the second set at 1-1 with Ferrer.

14.03: But Berdych follows with a hold to love as Djokovic fires a forehand wide and the Serb is now serving to stay in the set.

14.00: Djokovic holds to 30 but and as well as the Serb is playing, Berdych seems to have an answer to everything the top seed throws at him so far. It's 5-5.

Playing through the pain: Del Potro rests on the net but took the first set against David Ferrer (below)

13.57: No such problems for Del Potro though who survives a break point to take the first set against Ferrer 6-2.

The Spaniard looks so out-of-sorts at the moment that he even puts his new shirt on back-to-front before quickly amending his error.

13.54: Still no way through for Djokovic who takes the Berdych serve to deuce but fails to break again. The Serb is now serving to stay in the first set.

Tomas on top form: Berdych (above) had Djokovic chasing all round Court 1

13.51: From Sportsmail's Mike Dickson:

'Good to see one of Wimbledon's most modest superstars Stefan Edberg walking around the grounds. Even now he manages to melt into the background and go virtually unnoticed.'

13.48: Smart gameplan this from Del Potro. Get this match won and get it won quickly. The Argentine breaks again to lead 5-2 and is now preparing to serve out the first set.

It's still even at 4-4 on Court 1 between Djokovic and Berdych.

13.45: I didn't think I would be using this graphic again after the early exits of Victoria Azarenka and Maria Sharapova, but then there is this update from Sportsmail's 'unimpressed' Alex Kay:

'Not enjoying Djokovic's grunting.'

13.42: Working to Del Potro's advantage is his huge serve which is acting as a useful defence (in an attacking sort of way). The Argentine holds again to lead 4-2.

At full stretch: Novak Djokovic returns a shot to Tomas Berdych

13.39: Still nothing separates Berdych and Djokovic at 3-3, while Ferrer holds to trail 3-2. Del Potro may have the advantage but he is showing considerable pain. There is a noticeable limp but the Argentine continues for now.

The crowd have noticed his desire to stay out there and are getting fully behind the eighth seed.

13.36: No let up from Del Potro who rifles down a 126mph serve to hold at 3-1. Ferrer is a smart cookie though and is making sure he uses the drop shot when he can to make the Argentine dash around on those injured legs.

13.33: Injury? What injury?! Del Potro breaks in the third game to move 2-1 ahead against Ferrer. It must be noted though that the Spaniard was also not at his best fitness wise going into this clash.

13.30: From British No 1 Laura Robson, who at least for the meantime can sit on a London tube without being noticed - can't see that lasting if she continues to build on her Wimbledon performance this year:

'On the tube and the guy next to me is reading a paper with my face on it. He hasn't realised... #awkward.'

13.27: Del Potro soldiers on for now and at least holds to level at 1-1. John McEnroe has doubts though that he will go beyond a set.

13.24: From Sportsmail's Alex Kay on Del Potro's injury:

'Del Potro looks in huge pain. He tells the doctor he can't extend his knee. They have ruled out putting any more strapping on it. He will now be given some painkillers to see if he can carry on.'

13.21: Del Potro will continue for now, but he looks in huge pain as Ferrer recovers to deuce. Meanwhile it's 1-1 on Court 1, with Berdych already having to save a break point - which he did with a powerful forehand winner.

13.18: Huge news on Centre Court. We were worried about Ferrer's condition going into this match but it is Del Potro who has rolled his ankle while slipping to return a shot and with two break points and requires urgent treatment from the trainer.

From Sportsmail's Mike Dickson:

'Juan Martin Del Potro waiting for the doctor to arrive after nasty fall seems to have further hurt his knee. Centre Court has by and large not seen as many falls as, for example, Court 2. This might also mean Andy Murray on earlier, but that isn’t the priority right now.'

'Luke Milligan, former professional tennis player and now an LTA coach, keeps being mistaken for Rory McIlroy around Wimbledon.

'Milligan has a similar jaunty walk and the same curly hair as the golfer who was working out in the players gym during the opening week of the tournament. Luke said: It's happened quite often that people have mixed me up with Rory, especially when I'm wearing a baseball hat.'

13.12: We are underway on Court 1. Tomas Berdych and his big serve will begin against top seed Novak Djokovic.

13.09: Well it's not everyday you see this. At the sight of seeing Sir Alex Ferguson in the Royal Box, Manchester United defender Nemanja Vidic has given up his ticket at Centre Court to avoid his former manager and gone over to Court 1 instead.

Of course I am just joking. The Serb's real motive is to see compatriot Djokovic play for a place in the semi-final instead.

From Sportsmail's Jon McEvoy:

'Sir Alex in the Royal Box. Where better for an old trade unionist?'

Top brass: England boss Roy Hodgson was with Sir Alex Ferguson in the Royal Box

13.06: Novak Djokovic and Tomas Berdych have arrived on Court 1, while David Ferrer and Juan Martin del Potro come out to an open roof on Centre Court. Some threatening skies with rain still hang over SW19.

13.01: From Sportsmail's Ivan Speck:

'Among the famous faces in the Royal Box today are those belonging to former US tennis player Pam Shriver and James Bond actor George Lazenby whose acrimonious divorce from each other was finally ratified in 2011.'

12.56: From Sportsmail's Alan Fraser:

'Big shock this morning in the Wimbledon boys’ singles event with huge-serving Australian Nick Krygios being thumped in straight sets by bespectacled South Korean Hyeon Chung. That should ease the path to ultimate victory for British teenager Kyle Edmund.'

The surface of the courts have taken some stick this year but as the baselines naturally show some wear and tear into the second week, here is a neat video meeting SW19's head groundsman:

12.51: Fans keen to see a glance of the future of British tennis may want to keep an eye on events down at Court 14. It's the third round of the boy's singles and it's Kyle Edmund taking on Jonny O'Mara in an all-British clash. The players have just arrived on court.

12.48: There is very little sign of the clouds clearing at SW19, but the roof is staying open it seems on Centre Court. I like the positive thinking if nothing else.

Off to SW19: Fans queue at Wimbledon ahead of men's quarter-final day

12.45: While we wait for the main action to get underway, Sportsmail's Laurie Whitwell has taken to Court 3 to get his tennis fix for the morning as well as seeing an old favourite do what he does best:

'As my colleague Neil Moxley suggested, Court 3 is a fine start to the day's entertainment. The McEnroe brothers are the main draw but Mansour Bahrami is providing his usual playful humour.

'Having held onto a ball at the end of a previous point he brought it back into play instead of hitting a deep groundstroke he had stretched for unsuccessfully. Much mirth in the crowd but he lost the point anyway.

'His partner Henri Laconte, meanwhile, is wearing a chic, white flat cap and occasionally singing. John McEnroe has just served it out to win 6-1, 6-4. Standing ovation.'

12.40: It's very unlikely that Ferrer will be 100 per cent fit judging by his injury troubles this morning but the good news is Wimbledon chiefs still maintain that the Spaniard's quarter-final with Del Potro will go ahead as planned from 1pm on Centre Court. It appears to be a toe injury on the left foot which is troubling the fourth seed.

Unlikely duo: Andy Murray (right) practiced with former British No 1 Greg Rusedski as preparation to face the left-handed Fernando Verdasco in his Wimbledon quarter-final

'Interesting that Greg Rusedski is warming up Andy Murray as a lefthander, the two haven't always been close but goodwill conquers.'

Past and present: Former British No 1 Greg Rusedski (left) warms up with Andy Murray

12.05: You just get the feeling it won't be David Ferrer's day as Sportsmail's Mike Dickson has more on the Spaniard's bad luck:

'Apparently David Ferrer’s long-time coach Javier Piles has been back in Spain due to a family illness, which won’t help his charge get through a Little v Large contest against the impressive Del Potro. Also interesting to see if Djokovic’s first outing on Court One has any bearing – his opponent Berdych has played there three straight matches.'

12.00: Remember that war of attrition between Ferrer and Del Potro I predicted - it may not even last a set. Alex Kay with some worrying news:

'Big concerns here that David Ferrer might not play his quarter-final. He only practised for one minute and is now seeing the doctor. Would be a huge shame.'

11.55: It can't just be me that thinks the call for the trainer has been on the increase - so Charlie Sale has given us some info on the rules during the match:

'With Andy Murray known to be theatrical at times over injuries, it's apposite on quarter-final day that the Honorary Stewards daily bulletin has detailed the medical rules for the tournament.

'The players are allowed a medical timeout of upto 3 minutes for each different medical condition they might suffer during the match? An exception is for cramp; for this treatment must be fitted to the existing breaks between games and sets. Each player is also allowed a loo break twice each match, but only at the end of a set.'

Preparation: Andy Murray arrives to practice before his quarter-final with Fernando Verdasco

11.52: Of course there is plenty of other action going on today, with doubles competition, junior events and a few old favourites featuring across the outside courts. Sportsmail's Neil Moxley has more

'John McEnroe is just box office. Heading out to Court No 3, he was asked for his autograph from the moment he stepped onto the passageway down there and obliged with every single request. McEnroe's invitation doubles match against Mansour Bahrami and Henri Leconte should be worth taking in a few games.'

Great Scot: Sir Alex Ferguson arrives for the day's play alongside Judy Murray

11.42: And here is something else to look out for courtesy of Charlie Sale:

'Andy Murray's mother Judy, whose numerous tweets haven't always been appreciated by her son, promised to limit herself to just one-a-day during Wimbledon. However she posted six messages yesterday and might not be able to resist tweeting about former underwear male model Fernando Verdasco, Murray's quarter-final opponent today.'

11.39: Don't forget Andy Murray will be last up on Centre Court when he takes on Fernando Verdasco - play opens on the main court with David Ferrer taking on Juan Martin del Potro.

Sportsmail's Charlie Sale is also at SW19 - where a certain ex-Manchester United manager has arrived:

'Big name football managers past and present will be cheering on Andy Murray from the Royal Box today. Former Manchester United boss Sir Alex Ferguson is in there as is current England boss Roy Hodgson.

'Fergie accompanied by Sean Connery , who had both seemingly enjoyed the hospitality at Flushing Meadow, made an impromptu appearance at a Murray Press conference during the US Open last year. Can't see Fergie doing that at Wimbledon.

'Also in the Royal Box are England rugby boss Stuart Lancaster and RFU chief executive Ian Ritchie, who used to be in charge at the All England Club.'

The latter looks like it could be a war of attrition judging by their respective fitness concerns.

11.36: So to the weather which badly affected the women's quarter-finals yesterday. Our part-time weatherman Jon McEvoy gives us his take on what conditions to expect:

'The official weather forecast. Let’s see if they get it right today… Cloudy this morning with a 20pc chance of some patchy drizzle, although the risk will be diminishing as temperatures rise later this morning.

'Becoming brighter this afternoon, although still with a good deal of cloud. Some sunny spells should develop later this afternoon. Light to moderate NW’ly winds will be W’ly and reduce light this afternoon. In the sunshine maximum temperatures of 21 deg C (70F) will feel warm during the latter part of the afternoon.

'Umbrellas up already. I’m going to be watching Djokovic on Court One. Heaven help us. Nobody wants a stop-start day.'

Ready to go: Fans prepare for men's quarter-final day at Wimbledon

11.33: And a good morning to our team of reporters pitching in around the courts at Wimbledon. First to Alex Kay who has a few insights from the players' morning practice:

'Just seen two very different demeanours from two of our quarter-finalists. Novak Djokovic was singing as he walked off for a practice on Court No 15. David Ferrer was looking glum and limping on the way back from his. Wonder if I'm backing Del Potro to beat him now.'

11.30: Morning folks. It's been a walk in the park for Andy Murray at Wimbledon 2013 so far, with the Brit's quest towards successive finals at SW19 looking more convincing as the tournament progresses.

It's Fernando Verdasco today for the Scot and is it wrong to expect another straight forward victory? It doesn't seem to be a very British thing to expect...especially in tennis.